Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /************************************************************************ |
| 2 | * Copyright 2003 Digi International (www.digi.com) |
| 3 | * |
| 4 | * Copyright (C) 2004 IBM Corporation. All rights reserved. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2, or (at your option) |
| 9 | * any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED; without even the |
| 13 | * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
| 14 | * PURPOSE. See the GNU General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 * Temple Place - Suite 330, Boston, |
| 19 | * MA 02111-1307, USA. |
| 20 | * |
| 21 | * Contact Information: |
| 22 | * Scott H Kilau <Scott_Kilau@digi.com> |
V. Ananda Krishnan | 0a577ce | 2006-02-03 03:04:30 -0800 | [diff] [blame] | 23 | * Ananda Venkatarman <mansarov@us.ibm.com> |
| 24 | * Modifications: |
| 25 | * 01/19/06: changed jsm_input routine to use the dynamically allocated |
| 26 | * tty_buffer changes. Contributors: Scott Kilau and Ananda V. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | ***********************************************************************/ |
| 28 | #include <linux/tty.h> |
| 29 | #include <linux/tty_flip.h> |
| 30 | #include <linux/serial_reg.h> |
| 31 | #include <linux/delay.h> /* For udelay */ |
| 32 | #include <linux/pci.h> |
| 33 | |
| 34 | #include "jsm.h" |
| 35 | |
Adrian Bunk | 408b664 | 2005-05-01 08:59:29 -0700 | [diff] [blame] | 36 | static void jsm_carrier(struct jsm_channel *ch); |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | static inline int jsm_get_mstat(struct jsm_channel *ch) |
| 39 | { |
| 40 | unsigned char mstat; |
| 41 | unsigned result; |
| 42 | |
| 43 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "start\n"); |
| 44 | |
| 45 | mstat = (ch->ch_mostat | ch->ch_mistat); |
| 46 | |
| 47 | result = 0; |
| 48 | |
| 49 | if (mstat & UART_MCR_DTR) |
| 50 | result |= TIOCM_DTR; |
| 51 | if (mstat & UART_MCR_RTS) |
| 52 | result |= TIOCM_RTS; |
| 53 | if (mstat & UART_MSR_CTS) |
| 54 | result |= TIOCM_CTS; |
| 55 | if (mstat & UART_MSR_DSR) |
| 56 | result |= TIOCM_DSR; |
| 57 | if (mstat & UART_MSR_RI) |
| 58 | result |= TIOCM_RI; |
| 59 | if (mstat & UART_MSR_DCD) |
| 60 | result |= TIOCM_CD; |
| 61 | |
| 62 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); |
| 63 | return result; |
| 64 | } |
| 65 | |
| 66 | static unsigned int jsm_tty_tx_empty(struct uart_port *port) |
| 67 | { |
| 68 | return TIOCSER_TEMT; |
| 69 | } |
| 70 | |
| 71 | /* |
| 72 | * Return modem signals to ld. |
| 73 | */ |
| 74 | static unsigned int jsm_tty_get_mctrl(struct uart_port *port) |
| 75 | { |
| 76 | int result; |
| 77 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 78 | |
| 79 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); |
| 80 | |
| 81 | result = jsm_get_mstat(channel); |
| 82 | |
| 83 | if (result < 0) |
| 84 | return -ENXIO; |
| 85 | |
| 86 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
| 87 | |
| 88 | return result; |
| 89 | } |
| 90 | |
| 91 | /* |
| 92 | * jsm_set_modem_info() |
| 93 | * |
| 94 | * Set modem signals, called by ld. |
| 95 | */ |
| 96 | static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl) |
| 97 | { |
| 98 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 99 | |
| 100 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); |
| 101 | |
| 102 | if (mctrl & TIOCM_RTS) |
| 103 | channel->ch_mostat |= UART_MCR_RTS; |
| 104 | else |
| 105 | channel->ch_mostat &= ~UART_MCR_RTS; |
| 106 | |
| 107 | if (mctrl & TIOCM_DTR) |
| 108 | channel->ch_mostat |= UART_MCR_DTR; |
| 109 | else |
| 110 | channel->ch_mostat &= ~UART_MCR_DTR; |
| 111 | |
| 112 | channel->ch_bd->bd_ops->assert_modem_signals(channel); |
| 113 | |
| 114 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
| 115 | udelay(10); |
| 116 | } |
| 117 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 118 | static void jsm_tty_start_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | { |
| 120 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 121 | |
| 122 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); |
| 123 | |
| 124 | channel->ch_flags &= ~(CH_STOP); |
| 125 | jsm_tty_write(port); |
| 126 | |
| 127 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
| 128 | } |
| 129 | |
Russell King | b129a8c | 2005-08-31 10:12:14 +0100 | [diff] [blame] | 130 | static void jsm_tty_stop_tx(struct uart_port *port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | { |
| 132 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 133 | |
| 134 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "start\n"); |
| 135 | |
| 136 | channel->ch_flags |= (CH_STOP); |
| 137 | |
| 138 | jsm_printk(IOCTL, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
| 139 | } |
| 140 | |
| 141 | static void jsm_tty_send_xchar(struct uart_port *port, char ch) |
| 142 | { |
| 143 | unsigned long lock_flags; |
| 144 | struct jsm_channel *channel = (struct jsm_channel *)port; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 145 | struct ktermios *termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
| 147 | spin_lock_irqsave(&port->lock, lock_flags); |
Alan Cox | df4f4dd | 2008-07-16 21:53:50 +0100 | [diff] [blame] | 148 | termios = port->info->port.tty->termios; |
Jesper Juhl | a58e00e | 2006-03-31 02:32:12 -0800 | [diff] [blame] | 149 | if (ch == termios->c_cc[VSTART]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | channel->ch_bd->bd_ops->send_start_character(channel); |
| 151 | |
Jesper Juhl | a58e00e | 2006-03-31 02:32:12 -0800 | [diff] [blame] | 152 | if (ch == termios->c_cc[VSTOP]) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | channel->ch_bd->bd_ops->send_stop_character(channel); |
| 154 | spin_unlock_irqrestore(&port->lock, lock_flags); |
| 155 | } |
| 156 | |
| 157 | static void jsm_tty_stop_rx(struct uart_port *port) |
| 158 | { |
| 159 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 160 | |
| 161 | channel->ch_bd->bd_ops->disable_receiver(channel); |
| 162 | } |
| 163 | |
Paul Larson | 0461ec5 | 2009-01-30 10:21:49 -0600 | [diff] [blame] | 164 | static void jsm_tty_enable_ms(struct uart_port *port) |
| 165 | { |
| 166 | /* Nothing needed */ |
| 167 | } |
| 168 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | static void jsm_tty_break(struct uart_port *port, int break_state) |
| 170 | { |
| 171 | unsigned long lock_flags; |
| 172 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 173 | |
| 174 | spin_lock_irqsave(&port->lock, lock_flags); |
| 175 | if (break_state == -1) |
| 176 | channel->ch_bd->bd_ops->send_break(channel); |
| 177 | else |
| 178 | channel->ch_bd->bd_ops->clear_break(channel, 0); |
| 179 | |
| 180 | spin_unlock_irqrestore(&port->lock, lock_flags); |
| 181 | } |
| 182 | |
| 183 | static int jsm_tty_open(struct uart_port *port) |
| 184 | { |
| 185 | struct jsm_board *brd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | struct jsm_channel *channel = (struct jsm_channel *)port; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 187 | struct ktermios *termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
| 189 | /* Get board pointer from our array of majors we have allocated */ |
| 190 | brd = channel->ch_bd; |
| 191 | |
| 192 | /* |
| 193 | * Allocate channel buffers for read/write/error. |
| 194 | * Set flag, so we don't get trounced on. |
| 195 | */ |
| 196 | channel->ch_flags |= (CH_OPENING); |
| 197 | |
| 198 | /* Drop locks, as malloc with GFP_KERNEL can sleep */ |
| 199 | |
| 200 | if (!channel->ch_rqueue) { |
Burman Yan | 8f31bb3 | 2007-02-14 00:33:07 -0800 | [diff] [blame] | 201 | channel->ch_rqueue = kzalloc(RQUEUESIZE, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | if (!channel->ch_rqueue) { |
| 203 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, |
| 204 | "unable to allocate read queue buf"); |
| 205 | return -ENOMEM; |
| 206 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
| 208 | if (!channel->ch_equeue) { |
Burman Yan | 8f31bb3 | 2007-02-14 00:33:07 -0800 | [diff] [blame] | 209 | channel->ch_equeue = kzalloc(EQUEUESIZE, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | if (!channel->ch_equeue) { |
| 211 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, |
| 212 | "unable to allocate error queue buf"); |
| 213 | return -ENOMEM; |
| 214 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
| 216 | if (!channel->ch_wqueue) { |
Burman Yan | 8f31bb3 | 2007-02-14 00:33:07 -0800 | [diff] [blame] | 217 | channel->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | if (!channel->ch_wqueue) { |
| 219 | jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev, |
| 220 | "unable to allocate write queue buf"); |
| 221 | return -ENOMEM; |
| 222 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
| 224 | |
| 225 | channel->ch_flags &= ~(CH_OPENING); |
| 226 | /* |
| 227 | * Initialize if neither terminal is open. |
| 228 | */ |
| 229 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, |
| 230 | "jsm_open: initializing channel in open...\n"); |
| 231 | |
| 232 | /* |
| 233 | * Flush input queues. |
| 234 | */ |
| 235 | channel->ch_r_head = channel->ch_r_tail = 0; |
| 236 | channel->ch_e_head = channel->ch_e_tail = 0; |
| 237 | channel->ch_w_head = channel->ch_w_tail = 0; |
| 238 | |
| 239 | brd->bd_ops->flush_uart_write(channel); |
| 240 | brd->bd_ops->flush_uart_read(channel); |
| 241 | |
| 242 | channel->ch_flags = 0; |
| 243 | channel->ch_cached_lsr = 0; |
| 244 | channel->ch_stops_sent = 0; |
| 245 | |
Alan Cox | df4f4dd | 2008-07-16 21:53:50 +0100 | [diff] [blame] | 246 | termios = port->info->port.tty->termios; |
Jesper Juhl | a58e00e | 2006-03-31 02:32:12 -0800 | [diff] [blame] | 247 | channel->ch_c_cflag = termios->c_cflag; |
| 248 | channel->ch_c_iflag = termios->c_iflag; |
| 249 | channel->ch_c_oflag = termios->c_oflag; |
| 250 | channel->ch_c_lflag = termios->c_lflag; |
| 251 | channel->ch_startc = termios->c_cc[VSTART]; |
| 252 | channel->ch_stopc = termios->c_cc[VSTOP]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
| 254 | /* Tell UART to init itself */ |
| 255 | brd->bd_ops->uart_init(channel); |
| 256 | |
| 257 | /* |
| 258 | * Run param in case we changed anything |
| 259 | */ |
| 260 | brd->bd_ops->param(channel); |
| 261 | |
| 262 | jsm_carrier(channel); |
| 263 | |
| 264 | channel->ch_open_count++; |
| 265 | |
| 266 | jsm_printk(OPEN, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
Breno Leitao | 8e7d91c | 2009-04-07 16:53:48 +0100 | [diff] [blame^] | 267 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | } |
| 269 | |
| 270 | static void jsm_tty_close(struct uart_port *port) |
| 271 | { |
| 272 | struct jsm_board *bd; |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 273 | struct ktermios *ts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 275 | |
| 276 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "start\n"); |
| 277 | |
| 278 | bd = channel->ch_bd; |
Alan Cox | f751928 | 2009-01-02 13:49:21 +0000 | [diff] [blame] | 279 | ts = port->info->port.tty->termios; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | |
| 281 | channel->ch_flags &= ~(CH_STOPI); |
| 282 | |
| 283 | channel->ch_open_count--; |
| 284 | |
| 285 | /* |
| 286 | * If we have HUPCL set, lower DTR and RTS |
| 287 | */ |
| 288 | if (channel->ch_c_cflag & HUPCL) { |
| 289 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, |
| 290 | "Close. HUPCL set, dropping DTR/RTS\n"); |
| 291 | |
| 292 | /* Drop RTS/DTR */ |
| 293 | channel->ch_mostat &= ~(UART_MCR_DTR | UART_MCR_RTS); |
| 294 | bd->bd_ops->assert_modem_signals(channel); |
| 295 | } |
| 296 | |
| 297 | channel->ch_old_baud = 0; |
| 298 | |
| 299 | /* Turn off UART interrupts for this port */ |
| 300 | channel->ch_bd->bd_ops->uart_off(channel); |
| 301 | |
| 302 | jsm_printk(CLOSE, INFO, &channel->ch_bd->pci_dev, "finish\n"); |
| 303 | } |
| 304 | |
| 305 | static void jsm_tty_set_termios(struct uart_port *port, |
Alan Cox | 606d099 | 2006-12-08 02:38:45 -0800 | [diff] [blame] | 306 | struct ktermios *termios, |
| 307 | struct ktermios *old_termios) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | { |
| 309 | unsigned long lock_flags; |
| 310 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 311 | |
| 312 | spin_lock_irqsave(&port->lock, lock_flags); |
| 313 | channel->ch_c_cflag = termios->c_cflag; |
| 314 | channel->ch_c_iflag = termios->c_iflag; |
| 315 | channel->ch_c_oflag = termios->c_oflag; |
| 316 | channel->ch_c_lflag = termios->c_lflag; |
| 317 | channel->ch_startc = termios->c_cc[VSTART]; |
| 318 | channel->ch_stopc = termios->c_cc[VSTOP]; |
| 319 | |
| 320 | channel->ch_bd->bd_ops->param(channel); |
| 321 | jsm_carrier(channel); |
| 322 | spin_unlock_irqrestore(&port->lock, lock_flags); |
| 323 | } |
| 324 | |
| 325 | static const char *jsm_tty_type(struct uart_port *port) |
| 326 | { |
| 327 | return "jsm"; |
| 328 | } |
| 329 | |
| 330 | static void jsm_tty_release_port(struct uart_port *port) |
| 331 | { |
| 332 | } |
| 333 | |
| 334 | static int jsm_tty_request_port(struct uart_port *port) |
| 335 | { |
| 336 | return 0; |
| 337 | } |
| 338 | |
| 339 | static void jsm_config_port(struct uart_port *port, int flags) |
| 340 | { |
| 341 | port->type = PORT_JSM; |
| 342 | } |
| 343 | |
| 344 | static struct uart_ops jsm_ops = { |
| 345 | .tx_empty = jsm_tty_tx_empty, |
| 346 | .set_mctrl = jsm_tty_set_mctrl, |
| 347 | .get_mctrl = jsm_tty_get_mctrl, |
| 348 | .stop_tx = jsm_tty_stop_tx, |
| 349 | .start_tx = jsm_tty_start_tx, |
| 350 | .send_xchar = jsm_tty_send_xchar, |
| 351 | .stop_rx = jsm_tty_stop_rx, |
Paul Larson | 0461ec5 | 2009-01-30 10:21:49 -0600 | [diff] [blame] | 352 | .enable_ms = jsm_tty_enable_ms, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | .break_ctl = jsm_tty_break, |
| 354 | .startup = jsm_tty_open, |
| 355 | .shutdown = jsm_tty_close, |
| 356 | .set_termios = jsm_tty_set_termios, |
| 357 | .type = jsm_tty_type, |
| 358 | .release_port = jsm_tty_release_port, |
| 359 | .request_port = jsm_tty_request_port, |
| 360 | .config_port = jsm_config_port, |
| 361 | }; |
| 362 | |
| 363 | /* |
| 364 | * jsm_tty_init() |
| 365 | * |
| 366 | * Init the tty subsystem. Called once per board after board has been |
| 367 | * downloaded and init'ed. |
| 368 | */ |
Breno Leitao | aacf17a | 2009-04-06 17:34:17 +0100 | [diff] [blame] | 369 | int __devinit jsm_tty_init(struct jsm_board *brd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | { |
| 371 | int i; |
| 372 | void __iomem *vaddr; |
| 373 | struct jsm_channel *ch; |
| 374 | |
| 375 | if (!brd) |
| 376 | return -ENXIO; |
| 377 | |
| 378 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); |
| 379 | |
| 380 | /* |
| 381 | * Initialize board structure elements. |
| 382 | */ |
| 383 | |
| 384 | brd->nasync = brd->maxports; |
| 385 | |
| 386 | /* |
| 387 | * Allocate channel memory that might not have been allocated |
| 388 | * when the driver was first loaded. |
| 389 | */ |
| 390 | for (i = 0; i < brd->nasync; i++) { |
| 391 | if (!brd->channels[i]) { |
| 392 | |
| 393 | /* |
| 394 | * Okay to malloc with GFP_KERNEL, we are not at |
| 395 | * interrupt context, and there are no locks held. |
| 396 | */ |
Burman Yan | 8f31bb3 | 2007-02-14 00:33:07 -0800 | [diff] [blame] | 397 | brd->channels[i] = kzalloc(sizeof(struct jsm_channel), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | if (!brd->channels[i]) { |
| 399 | jsm_printk(CORE, ERR, &brd->pci_dev, |
| 400 | "%s:%d Unable to allocate memory for channel struct\n", |
| 401 | __FILE__, __LINE__); |
| 402 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | } |
| 404 | } |
| 405 | |
| 406 | ch = brd->channels[0]; |
| 407 | vaddr = brd->re_map_membase; |
| 408 | |
| 409 | /* Set up channel variables */ |
| 410 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { |
| 411 | |
| 412 | if (!brd->channels[i]) |
| 413 | continue; |
| 414 | |
| 415 | spin_lock_init(&ch->ch_lock); |
| 416 | |
| 417 | if (brd->bd_uart_offset == 0x200) |
| 418 | ch->ch_neo_uart = vaddr + (brd->bd_uart_offset * i); |
| 419 | |
| 420 | ch->ch_bd = brd; |
| 421 | ch->ch_portnum = i; |
| 422 | |
| 423 | /* .25 second delay */ |
| 424 | ch->ch_close_delay = 250; |
| 425 | |
| 426 | init_waitqueue_head(&ch->ch_flags_wait); |
| 427 | } |
| 428 | |
| 429 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); |
| 430 | return 0; |
| 431 | } |
| 432 | |
Breno Leitao | aacf17a | 2009-04-06 17:34:17 +0100 | [diff] [blame] | 433 | int __devinit jsm_uart_port_init(struct jsm_board *brd) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | { |
| 435 | int i; |
| 436 | struct jsm_channel *ch; |
| 437 | |
| 438 | if (!brd) |
| 439 | return -ENXIO; |
| 440 | |
| 441 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); |
| 442 | |
| 443 | /* |
| 444 | * Initialize board structure elements. |
| 445 | */ |
| 446 | |
| 447 | brd->nasync = brd->maxports; |
| 448 | |
| 449 | /* Set up channel variables */ |
| 450 | for (i = 0; i < brd->nasync; i++, ch = brd->channels[i]) { |
| 451 | |
| 452 | if (!brd->channels[i]) |
| 453 | continue; |
| 454 | |
| 455 | brd->channels[i]->uart_port.irq = brd->irq; |
Len Sorensen | 3c04c27 | 2007-05-08 00:26:30 -0700 | [diff] [blame] | 456 | brd->channels[i]->uart_port.uartclk = 14745600; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | brd->channels[i]->uart_port.type = PORT_JSM; |
| 458 | brd->channels[i]->uart_port.iotype = UPIO_MEM; |
| 459 | brd->channels[i]->uart_port.membase = brd->re_map_membase; |
| 460 | brd->channels[i]->uart_port.fifosize = 16; |
| 461 | brd->channels[i]->uart_port.ops = &jsm_ops; |
| 462 | brd->channels[i]->uart_port.line = brd->channels[i]->ch_portnum + brd->boardnum * 2; |
| 463 | if (uart_add_one_port (&jsm_uart_driver, &brd->channels[i]->uart_port)) |
| 464 | printk(KERN_INFO "Added device failed\n"); |
| 465 | else |
| 466 | printk(KERN_INFO "Added device \n"); |
| 467 | } |
| 468 | |
| 469 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); |
| 470 | return 0; |
| 471 | } |
| 472 | |
| 473 | int jsm_remove_uart_port(struct jsm_board *brd) |
| 474 | { |
| 475 | int i; |
| 476 | struct jsm_channel *ch; |
| 477 | |
| 478 | if (!brd) |
| 479 | return -ENXIO; |
| 480 | |
| 481 | jsm_printk(INIT, INFO, &brd->pci_dev, "start\n"); |
| 482 | |
| 483 | /* |
| 484 | * Initialize board structure elements. |
| 485 | */ |
| 486 | |
| 487 | brd->nasync = brd->maxports; |
| 488 | |
| 489 | /* Set up channel variables */ |
| 490 | for (i = 0; i < brd->nasync; i++) { |
| 491 | |
| 492 | if (!brd->channels[i]) |
| 493 | continue; |
| 494 | |
| 495 | ch = brd->channels[i]; |
| 496 | |
| 497 | uart_remove_one_port(&jsm_uart_driver, &brd->channels[i]->uart_port); |
| 498 | } |
| 499 | |
| 500 | jsm_printk(INIT, INFO, &brd->pci_dev, "finish\n"); |
| 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | void jsm_input(struct jsm_channel *ch) |
| 505 | { |
| 506 | struct jsm_board *bd; |
| 507 | struct tty_struct *tp; |
| 508 | u32 rmask; |
| 509 | u16 head; |
| 510 | u16 tail; |
| 511 | int data_len; |
| 512 | unsigned long lock_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | int len = 0; |
| 514 | int n = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | int s = 0; |
| 516 | int i = 0; |
| 517 | |
| 518 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); |
| 519 | |
| 520 | if (!ch) |
| 521 | return; |
| 522 | |
Alan Cox | df4f4dd | 2008-07-16 21:53:50 +0100 | [diff] [blame] | 523 | tp = ch->uart_port.info->port.tty; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | |
| 525 | bd = ch->ch_bd; |
| 526 | if(!bd) |
| 527 | return; |
| 528 | |
| 529 | spin_lock_irqsave(&ch->ch_lock, lock_flags); |
| 530 | |
| 531 | /* |
| 532 | *Figure the number of characters in the buffer. |
| 533 | *Exit immediately if none. |
| 534 | */ |
| 535 | |
| 536 | rmask = RQUEUEMASK; |
| 537 | |
| 538 | head = ch->ch_r_head & rmask; |
| 539 | tail = ch->ch_r_tail & rmask; |
| 540 | |
| 541 | data_len = (head - tail) & rmask; |
| 542 | if (data_len == 0) { |
| 543 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 544 | return; |
| 545 | } |
| 546 | |
| 547 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start\n"); |
| 548 | |
| 549 | /* |
| 550 | *If the device is not open, or CREAD is off, flush |
| 551 | *input data and return immediately. |
| 552 | */ |
| 553 | if (!tp || |
| 554 | !(tp->termios->c_cflag & CREAD) ) { |
| 555 | |
| 556 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 557 | "input. dropping %d bytes on port %d...\n", data_len, ch->ch_portnum); |
| 558 | ch->ch_r_head = tail; |
| 559 | |
| 560 | /* Force queue flow control to be released, if needed */ |
| 561 | jsm_check_queue_flow_control(ch); |
| 562 | |
| 563 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 564 | return; |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * If we are throttled, simply don't read any data. |
| 569 | */ |
| 570 | if (ch->ch_flags & CH_STOPI) { |
| 571 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 572 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 573 | "Port %d throttled, not reading any data. head: %x tail: %x\n", |
| 574 | ch->ch_portnum, head, tail); |
| 575 | return; |
| 576 | } |
| 577 | |
| 578 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "start 2\n"); |
| 579 | |
Alan Cox | 7ba4b92 | 2007-10-16 23:27:05 -0700 | [diff] [blame] | 580 | if (data_len <= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
| 582 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "jsm_input 1\n"); |
| 583 | return; |
| 584 | } |
| 585 | |
Alan Cox | 7ba4b92 | 2007-10-16 23:27:05 -0700 | [diff] [blame] | 586 | len = tty_buffer_request_room(tp, data_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | n = len; |
| 588 | |
| 589 | /* |
| 590 | * n now contains the most amount of data we can copy, |
| 591 | * bounded either by the flip buffer size or the amount |
| 592 | * of data the card actually has pending... |
| 593 | */ |
| 594 | while (n) { |
| 595 | s = ((head >= tail) ? head : RQUEUESIZE) - tail; |
| 596 | s = min(s, n); |
| 597 | |
| 598 | if (s <= 0) |
| 599 | break; |
| 600 | |
V. Ananda Krishnan | 0a577ce | 2006-02-03 03:04:30 -0800 | [diff] [blame] | 601 | /* |
| 602 | * If conditions are such that ld needs to see all |
| 603 | * UART errors, we will have to walk each character |
| 604 | * and error byte and send them to the buffer one at |
| 605 | * a time. |
| 606 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | |
V. Ananda Krishnan | 0a577ce | 2006-02-03 03:04:30 -0800 | [diff] [blame] | 608 | if (I_PARMRK(tp) || I_BRKINT(tp) || I_INPCK(tp)) { |
| 609 | for (i = 0; i < s; i++) { |
| 610 | /* |
| 611 | * Give the Linux ld the flags in the |
| 612 | * format it likes. |
| 613 | */ |
| 614 | if (*(ch->ch_equeue +tail +i) & UART_LSR_BI) |
| 615 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_BREAK); |
| 616 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_PE) |
| 617 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_PARITY); |
| 618 | else if (*(ch->ch_equeue +tail +i) & UART_LSR_FE) |
| 619 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_FRAME); |
| 620 | else |
Alan Cox | 7ba4b92 | 2007-10-16 23:27:05 -0700 | [diff] [blame] | 621 | tty_insert_flip_char(tp, *(ch->ch_rqueue +tail +i), TTY_NORMAL); |
V. Ananda Krishnan | 0a577ce | 2006-02-03 03:04:30 -0800 | [diff] [blame] | 622 | } |
| 623 | } else { |
| 624 | tty_insert_flip_string(tp, ch->ch_rqueue + tail, s) ; |
| 625 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | tail += s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | n -= s; |
| 628 | /* Flip queue if needed */ |
| 629 | tail &= rmask; |
| 630 | } |
| 631 | |
V. Ananda Krishnan | 0a577ce | 2006-02-03 03:04:30 -0800 | [diff] [blame] | 632 | ch->ch_r_tail = tail & rmask; |
| 633 | ch->ch_e_tail = tail & rmask; |
| 634 | jsm_check_queue_flow_control(ch); |
| 635 | spin_unlock_irqrestore(&ch->ch_lock, lock_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
V. Ananda Krishnan | 0a577ce | 2006-02-03 03:04:30 -0800 | [diff] [blame] | 637 | /* Tell the tty layer its okay to "eat" the data now */ |
| 638 | tty_flip_buffer_push(tp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | jsm_printk(IOCTL, INFO, &ch->ch_bd->pci_dev, "finish\n"); |
| 641 | } |
| 642 | |
Adrian Bunk | 408b664 | 2005-05-01 08:59:29 -0700 | [diff] [blame] | 643 | static void jsm_carrier(struct jsm_channel *ch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | { |
| 645 | struct jsm_board *bd; |
| 646 | |
| 647 | int virt_carrier = 0; |
| 648 | int phys_carrier = 0; |
| 649 | |
| 650 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, "start\n"); |
| 651 | if (!ch) |
| 652 | return; |
| 653 | |
| 654 | bd = ch->ch_bd; |
| 655 | |
| 656 | if (!bd) |
| 657 | return; |
| 658 | |
| 659 | if (ch->ch_mistat & UART_MSR_DCD) { |
| 660 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, |
| 661 | "mistat: %x D_CD: %x\n", ch->ch_mistat, ch->ch_mistat & UART_MSR_DCD); |
| 662 | phys_carrier = 1; |
| 663 | } |
| 664 | |
| 665 | if (ch->ch_c_cflag & CLOCAL) |
| 666 | virt_carrier = 1; |
| 667 | |
| 668 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, |
| 669 | "DCD: physical: %d virt: %d\n", phys_carrier, virt_carrier); |
| 670 | |
| 671 | /* |
| 672 | * Test for a VIRTUAL carrier transition to HIGH. |
| 673 | */ |
| 674 | if (((ch->ch_flags & CH_FCAR) == 0) && (virt_carrier == 1)) { |
| 675 | |
| 676 | /* |
| 677 | * When carrier rises, wake any threads waiting |
| 678 | * for carrier in the open routine. |
| 679 | */ |
| 680 | |
| 681 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, |
| 682 | "carrier: virt DCD rose\n"); |
| 683 | |
| 684 | if (waitqueue_active(&(ch->ch_flags_wait))) |
| 685 | wake_up_interruptible(&ch->ch_flags_wait); |
| 686 | } |
| 687 | |
| 688 | /* |
| 689 | * Test for a PHYSICAL carrier transition to HIGH. |
| 690 | */ |
| 691 | if (((ch->ch_flags & CH_CD) == 0) && (phys_carrier == 1)) { |
| 692 | |
| 693 | /* |
| 694 | * When carrier rises, wake any threads waiting |
| 695 | * for carrier in the open routine. |
| 696 | */ |
| 697 | |
| 698 | jsm_printk(CARR, INFO, &ch->ch_bd->pci_dev, |
| 699 | "carrier: physical DCD rose\n"); |
| 700 | |
| 701 | if (waitqueue_active(&(ch->ch_flags_wait))) |
| 702 | wake_up_interruptible(&ch->ch_flags_wait); |
| 703 | } |
| 704 | |
| 705 | /* |
| 706 | * Test for a PHYSICAL transition to low, so long as we aren't |
| 707 | * currently ignoring physical transitions (which is what "virtual |
| 708 | * carrier" indicates). |
| 709 | * |
| 710 | * The transition of the virtual carrier to low really doesn't |
| 711 | * matter... it really only means "ignore carrier state", not |
| 712 | * "make pretend that carrier is there". |
| 713 | */ |
| 714 | if ((virt_carrier == 0) && ((ch->ch_flags & CH_CD) != 0) |
| 715 | && (phys_carrier == 0)) { |
| 716 | /* |
| 717 | * When carrier drops: |
| 718 | * |
| 719 | * Drop carrier on all open units. |
| 720 | * |
| 721 | * Flush queues, waking up any task waiting in the |
| 722 | * line discipline. |
| 723 | * |
| 724 | * Send a hangup to the control terminal. |
| 725 | * |
| 726 | * Enable all select calls. |
| 727 | */ |
| 728 | if (waitqueue_active(&(ch->ch_flags_wait))) |
| 729 | wake_up_interruptible(&ch->ch_flags_wait); |
| 730 | } |
| 731 | |
| 732 | /* |
| 733 | * Make sure that our cached values reflect the current reality. |
| 734 | */ |
| 735 | if (virt_carrier == 1) |
| 736 | ch->ch_flags |= CH_FCAR; |
| 737 | else |
| 738 | ch->ch_flags &= ~CH_FCAR; |
| 739 | |
| 740 | if (phys_carrier == 1) |
| 741 | ch->ch_flags |= CH_CD; |
| 742 | else |
| 743 | ch->ch_flags &= ~CH_CD; |
| 744 | } |
| 745 | |
| 746 | |
| 747 | void jsm_check_queue_flow_control(struct jsm_channel *ch) |
| 748 | { |
Jesper Juhl | a58e00e | 2006-03-31 02:32:12 -0800 | [diff] [blame] | 749 | struct board_ops *bd_ops = ch->ch_bd->bd_ops; |
Breno Leitao | 8e7d91c | 2009-04-07 16:53:48 +0100 | [diff] [blame^] | 750 | int qleft; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
| 752 | /* Store how much space we have left in the queue */ |
| 753 | if ((qleft = ch->ch_r_tail - ch->ch_r_head - 1) < 0) |
| 754 | qleft += RQUEUEMASK + 1; |
| 755 | |
| 756 | /* |
| 757 | * Check to see if we should enforce flow control on our queue because |
| 758 | * the ld (or user) isn't reading data out of our queue fast enuf. |
| 759 | * |
| 760 | * NOTE: This is done based on what the current flow control of the |
| 761 | * port is set for. |
| 762 | * |
| 763 | * 1) HWFLOW (RTS) - Turn off the UART's Receive interrupt. |
| 764 | * This will cause the UART's FIFO to back up, and force |
| 765 | * the RTS signal to be dropped. |
| 766 | * 2) SWFLOW (IXOFF) - Keep trying to send a stop character to |
| 767 | * the other side, in hopes it will stop sending data to us. |
| 768 | * 3) NONE - Nothing we can do. We will simply drop any extra data |
| 769 | * that gets sent into us when the queue fills up. |
| 770 | */ |
| 771 | if (qleft < 256) { |
| 772 | /* HWFLOW */ |
| 773 | if (ch->ch_c_cflag & CRTSCTS) { |
| 774 | if(!(ch->ch_flags & CH_RECEIVER_OFF)) { |
Jesper Juhl | a58e00e | 2006-03-31 02:32:12 -0800 | [diff] [blame] | 775 | bd_ops->disable_receiver(ch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | ch->ch_flags |= (CH_RECEIVER_OFF); |
| 777 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 778 | "Internal queue hit hilevel mark (%d)! Turning off interrupts.\n", |
| 779 | qleft); |
| 780 | } |
| 781 | } |
| 782 | /* SWFLOW */ |
| 783 | else if (ch->ch_c_iflag & IXOFF) { |
| 784 | if (ch->ch_stops_sent <= MAX_STOPS_SENT) { |
Jesper Juhl | a58e00e | 2006-03-31 02:32:12 -0800 | [diff] [blame] | 785 | bd_ops->send_stop_character(ch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | ch->ch_stops_sent++; |
| 787 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 788 | "Sending stop char! Times sent: %x\n", ch->ch_stops_sent); |
| 789 | } |
| 790 | } |
| 791 | } |
| 792 | |
| 793 | /* |
| 794 | * Check to see if we should unenforce flow control because |
| 795 | * ld (or user) finally read enuf data out of our queue. |
| 796 | * |
| 797 | * NOTE: This is done based on what the current flow control of the |
| 798 | * port is set for. |
| 799 | * |
| 800 | * 1) HWFLOW (RTS) - Turn back on the UART's Receive interrupt. |
| 801 | * This will cause the UART's FIFO to raise RTS back up, |
| 802 | * which will allow the other side to start sending data again. |
| 803 | * 2) SWFLOW (IXOFF) - Send a start character to |
| 804 | * the other side, so it will start sending data to us again. |
| 805 | * 3) NONE - Do nothing. Since we didn't do anything to turn off the |
| 806 | * other side, we don't need to do anything now. |
| 807 | */ |
| 808 | if (qleft > (RQUEUESIZE / 2)) { |
| 809 | /* HWFLOW */ |
| 810 | if (ch->ch_c_cflag & CRTSCTS) { |
| 811 | if (ch->ch_flags & CH_RECEIVER_OFF) { |
Jesper Juhl | a58e00e | 2006-03-31 02:32:12 -0800 | [diff] [blame] | 812 | bd_ops->enable_receiver(ch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | ch->ch_flags &= ~(CH_RECEIVER_OFF); |
| 814 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, |
| 815 | "Internal queue hit lowlevel mark (%d)! Turning on interrupts.\n", |
| 816 | qleft); |
| 817 | } |
| 818 | } |
| 819 | /* SWFLOW */ |
| 820 | else if (ch->ch_c_iflag & IXOFF && ch->ch_stops_sent) { |
| 821 | ch->ch_stops_sent = 0; |
Jesper Juhl | a58e00e | 2006-03-31 02:32:12 -0800 | [diff] [blame] | 822 | bd_ops->send_start_character(ch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | jsm_printk(READ, INFO, &ch->ch_bd->pci_dev, "Sending start char!\n"); |
| 824 | } |
| 825 | } |
| 826 | } |
| 827 | |
| 828 | /* |
| 829 | * jsm_tty_write() |
| 830 | * |
| 831 | * Take data from the user or kernel and send it out to the FEP. |
| 832 | * In here exists all the Transparent Print magic as well. |
| 833 | */ |
| 834 | int jsm_tty_write(struct uart_port *port) |
| 835 | { |
Breno Leitao | 8e7d91c | 2009-04-07 16:53:48 +0100 | [diff] [blame^] | 836 | int bufcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | int data_count = 0,data_count1 =0; |
| 838 | u16 head; |
| 839 | u16 tail; |
| 840 | u16 tmask; |
| 841 | u32 remain; |
| 842 | int temp_tail = port->info->xmit.tail; |
| 843 | struct jsm_channel *channel = (struct jsm_channel *)port; |
| 844 | |
| 845 | tmask = WQUEUEMASK; |
| 846 | head = (channel->ch_w_head) & tmask; |
| 847 | tail = (channel->ch_w_tail) & tmask; |
| 848 | |
| 849 | if ((bufcount = tail - head - 1) < 0) |
| 850 | bufcount += WQUEUESIZE; |
| 851 | |
Breno Leitao | 8e7d91c | 2009-04-07 16:53:48 +0100 | [diff] [blame^] | 852 | bufcount = min(bufcount, 56); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | remain = WQUEUESIZE - head; |
| 854 | |
| 855 | data_count = 0; |
Breno Leitao | 8e7d91c | 2009-04-07 16:53:48 +0100 | [diff] [blame^] | 856 | if (bufcount >= remain) { |
| 857 | bufcount -= remain; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | while ((port->info->xmit.head != temp_tail) && |
| 859 | (data_count < remain)) { |
| 860 | channel->ch_wqueue[head++] = |
| 861 | port->info->xmit.buf[temp_tail]; |
| 862 | |
| 863 | temp_tail++; |
| 864 | temp_tail &= (UART_XMIT_SIZE - 1); |
| 865 | data_count++; |
| 866 | } |
| 867 | if (data_count == remain) head = 0; |
| 868 | } |
| 869 | |
| 870 | data_count1 = 0; |
Breno Leitao | 8e7d91c | 2009-04-07 16:53:48 +0100 | [diff] [blame^] | 871 | if (bufcount > 0) { |
| 872 | remain = bufcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | while ((port->info->xmit.head != temp_tail) && |
| 874 | (data_count1 < remain)) { |
| 875 | channel->ch_wqueue[head++] = |
| 876 | port->info->xmit.buf[temp_tail]; |
| 877 | |
| 878 | temp_tail++; |
| 879 | temp_tail &= (UART_XMIT_SIZE - 1); |
| 880 | data_count1++; |
| 881 | |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | port->info->xmit.tail = temp_tail; |
| 886 | |
| 887 | data_count += data_count1; |
| 888 | if (data_count) { |
| 889 | head &= tmask; |
| 890 | channel->ch_w_head = head; |
| 891 | } |
| 892 | |
| 893 | if (data_count) { |
| 894 | channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel); |
| 895 | } |
| 896 | |
| 897 | return data_count; |
| 898 | } |